Which of the following sentences is the most appropriate and formal opening for an email to a teacher about a missed assignment?
A) Hey teacher, I missed my homework.
B) Hi, I couldn't do the assignment.
C) Dear Mr./Ms. [Teacher's Last Name], I am writing to explain why I was unable to submit my assignment on [Date].
D) Yo, my assignment is late.
E) Can I give you my homework now?
